{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46031", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.093Z", "datePublished": "2026-05-27T12:56:40.357Z", "dateUpdated": "2026-08-05T12:29:14.460Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:14.460Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ks8851: Reinstate disabling of BHs around IRQ handler\n\nIf the driver executes ks8851_irq() AND a TX packet has been sent, then\nthe driver enables TX queue via netif_wake_queue() which schedules TX\nsoftirq to queue packets for this device.\n\nIf CONFIG_PREEMPT_RT=y is set AND a packet has also been received by\nthe MAC, then ks8851_rx_pkts() calls netdev_alloc_skb_ip_align() to\nallocate SKBs for the received packets. If netdev_alloc_skb_ip_align()\nis called with BH enabled, then local_bh_enable() at the end of\nnetdev_alloc_skb_ip_align() will trigger the pending softirq processing,\nwhich may ultimately call the .xmit callback ks8851_start_xmit_par().\nThe ks8851_start_xmit_par() will try to lock struct ks8851_net_par\n.lock spinlock, which is already locked by ks8851_irq() from which\nks8851_start_xmit_par() was called. This leads to a deadlock, which\nis reported by the kernel, including a trace listed below.\n\nIf CONFIG_PREEMPT_RT is not set, then since commit 0913ec336a6c0\n(\"net: ks8851: Fix deadlock with the SPI chip variant\") the deadlock\ncan also be triggered without received packet in the RX FIFO. The\npending softirqs will be processed on return from\nspin_unlock_bh(&ks->statelock) in ks8851_irq(), which triggers the\ndeadlock as well.\n\nFix the problem by disabling BH around critical sections, including the\nIRQ handler, thus preventing the net_tx_action() softirq from triggering\nduring these critical sections. The net_tx_action() softirq is triggered\nonce BH are re-enabled and at the end of the IRQ handler, once all the\nother IRQ handler actions have been completed.\n\n __schedule from schedule_rtlock+0x1c/0x34\n schedule_rtlock from rtlock_slowlock_locked+0x548/0x904\n rtlock_slowlock_locked from rt_spin_lock+0x60/0x9c\n rt_spin_lock from ks8851_start_xmit_par+0x74/0x1a8\n ks8851_start_xmit_par from netdev_start_xmit+0x20/0x44\n netdev_start_xmit from dev_hard_start_xmit+0xd0/0x188\n dev_hard_start_xmit from sch_direct_xmit+0xb8/0x25c\n sch_direct_xmit from __qdisc_run+0x1f8/0x4ec\n __qdisc_run from qdisc_run+0x1c/0x28\n qdisc_run from net_tx_action+0x1f0/0x268\n net_tx_action from handle_softirqs+0x1a4/0x270\n handle_softirqs from __local_bh_enable_ip+0xcc/0xe0\n __local_bh_enable_ip from __alloc_skb+0xd8/0x128\n __alloc_skb from __netdev_alloc_skb+0x3c/0x19c\n __netdev_alloc_skb from ks8851_irq+0x388/0x4d4\n ks8851_irq from irq_thread_fn+0x24/0x64\n irq_thread_fn from irq_thread+0x178/0x28c\n irq_thread from kthread+0x12c/0x138\n kthread from ret_from_fork+0x14/0x28" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The deadlock is in a wired Ethernet NIC driver whose IRQ handler is driven by received network packets (RX interrupts) and elicited host responses (TX); routed traffic from a remote source reaches this path, making it remotely reachable.\nAC:L - The attacker controls both sides of the triggering condition by generating sustained bidirectional traffic (sending packets to cause RX, eliciting responses to cause TX/queue-wake); under load the structural deadlock manifests reliably, and the non-RT path occurs with default config.\nPR:N - Triggering requires only network traffic to/from the device with no authentication or local credentials.\nUI:N - No victim interaction is needed; the deadlock arises automatically from concurrent RX/TX processing.\nS:U - The deadlock is confined to the kernel that owns the driver; no security boundary is crossed.\nC:N - A lock-recursion deadlock discloses no memory or information.\nI:N - The bug only hangs execution; it provides no data modification or write primitive.\nA:H - The self-deadlock hangs the IRQ thread/CPU (hard spinlock lockup on non-RT, blocked rtmutex on RT), rendering the system or its network path unresponsive." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/micrel/ks8851.h", "drivers/net/ethernet/micrel/ks8851_common.c", "drivers/net/ethernet/micrel/ks8851_par.c", "drivers/net/ethernet/micrel/ks8851_spi.c" ], "versions": [ { "version": "8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545", "lessThan": "1962027a6d223f90df8b372929f9d1a8d321ad6a", "status": "affected", "versionType": "git" }, { "version": "ae87f661f3c1a3134a7ed86ab69bf9f12af88993", "lessThan": "640a7631d31db87d5fa1b34cea44a99b6e78854b", "status": "affected", "versionType": "git" }, { "version": "e0863634bf9f7cf36291ebb5bfa2d16632f79c49", "lessThan": "518040324067d8efaa2da1992297b7e7bf5640f4", "status": "affected", "versionType": "git" }, { "version": "e0863634bf9f7cf36291ebb5bfa2d16632f79c49", "lessThan": "be8aad558b4675f45b43080f81a9ffdeddea73a5", "status": "affected", "versionType": "git" }, { "version": "e0863634bf9f7cf36291ebb5bfa2d16632f79c49", "lessThan": "21f1707a8e978558dcb11b053855521e32ac0eec", "status": "affected", "versionType": "git" }, { "version": "e0863634bf9f7cf36291ebb5bfa2d16632f79c49", "lessThan": "5c9fcac3c872224316714d0d8914d9af16c76a6d", "status": "affected", "versionType": "git" }, { "version": "7e2901a2a9195da76111f351584bf77552a038f0", "status": "affected", "versionType": "git" }, { "version": "6.1.91", "lessThan": "6.1.175", "status": "affected", "versionType": "semver" }, { "version": "6.6.31", "lessThan": "6.6.140", "status": "affected", "versionType": "semver" }, { "version": "6.8.10", "lessThan": "6.9", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/micrel/ks8851.h", "drivers/net/ethernet/micrel/ks8851_common.c", "drivers/net/ethernet/micrel/ks8851_par.c", "drivers/net/ethernet/micrel/ks8851_spi.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.91", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.31", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1962027a6d223f90df8b372929f9d1a8d321ad6a" }, { "url": "https://git.kernel.org/stable/c/640a7631d31db87d5fa1b34cea44a99b6e78854b" }, { "url": "https://git.kernel.org/stable/c/518040324067d8efaa2da1992297b7e7bf5640f4" }, { "url": "https://git.kernel.org/stable/c/be8aad558b4675f45b43080f81a9ffdeddea73a5" }, { "url": "https://git.kernel.org/stable/c/21f1707a8e978558dcb11b053855521e32ac0eec" }, { "url": "https://git.kernel.org/stable/c/5c9fcac3c872224316714d0d8914d9af16c76a6d" } ], "title": "net: ks8851: Reinstate disabling of BHs around IRQ handler", "x_generator": { "engine": "bippy-1.2.0" } } } }